Welsbach lamp



No. 6|0,473. Patented Sept. 6, I898. F. A. CURTIS.

WELSBACH LAMP.

(Application filed Oct. 27, 1896.) (No Model.)

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FRANK A. CORTIS, OF MERIDEN, CONNECTICUT, ASSIGNOR OF ONE-HALF TO DWIGHTT. CORTIS, OF' BOSTON, MASSACHUSETTS.

WELSBACH LAMP.

SPECIFICATION forming part of Letters Patent No. 610,473, datedSeptember 6, 1898.

Application filed October 27, 1896. Serial No. 610,174. (No model.)

To all whom it may concern: i

Be it known that I, FRANK A. OORTIS, a citizen of the United States, anda resident of Meriden, in the county of New.I-Iaven and State ofConnecticut, have invented certain new and useful Improvements inWelsbach Lamps, of which the following is a full, clear, and exactdescriptionwhereby any one skilled in the art can make and use the same.

My invention relates directly to that class of so-called lamps in commonuse under the name of Welsbach and involving the use of a mantle ofextremely fragile materialas the part which is brought to a high stateof incandescence to provide the luminous body in the lamp. Owing to thefragilityof this material a comparatively light shock will cause it tobe broken, and thus destroy the essential feature in the lamp.

The object of my invention is to provide means whereby that part of thelamp to which the mantle is directly attached may be insulated fromshocks, particularly against those directly against the bracket or thelamp; and to this end my invention consists of the sectional burner-tubeso supported as to its parts one on the other as to provide a yieldingcushion to absorb any lateral jar; and it further consists in thedetails of the several parts making up the device as a whole and thecombination of such parts, as hereinafter described, and moreparticularly pointed out in the claims. 7

Referring to the drawings, Figure l is a view in side elevation of alVelsbach lamp with parts cut away to show construction.

- Fig. 2 is a detail view, on enlarged scale, showing the burner-tubewith parts cut away. Fig. 3 is a modified form of the burner-tube. Fig.4 is a detail view in horizontal section through the device on a planejust underneath the bottom of the lower section of the burnertube,looking down. Fig. 5 is a detail side view of the lower section of theburner-tube. Fig. 6 is a detail top view of the same.

In the accompanying drawings the letter a denotes a gas -bracket or likesupport on which that portion of the lamp which carries the mantle (andin the form herein shown the chimney also) is mounted.

b denotes'the shutter, which is a hollow structure through which amixer-tube 0 extends and having air-ports cl through which the desiredquantity of air may enter the burner to properly supportl combustion. Avalve or damper e is arranged in the shutter, so that by a slidingmovement the flow of air through the ports may be regulated.

The mixer-tube c, threaded to fit upon the gas-bracket, extends upwardthrough the airshutter, with openings through its walls to receive aninflow of air within the shutter, and from the upper part of the shutterthis mixer-tube extends into a burner-tube f. The burner-tube is made intwo sections g h, the upper section g being provided at the upper endwith a network above which the flame is located and .thelower section77. extending within the upper section and being considerably smaller indiameter than said upper section.

At a point within the upper section of the burner-tube there is locateda shoulder 2', formed in one instance by a ring extending around withinthe upper section 9 of said tube and secured to its wall or forming anintegral part thereof. This shoulder t rests upon the lower section h ofthe burner-tube and preferably upon its upper edge, and said shouldermay be continuous, or substantially so, its function being to form asupport on which the two sections may tilt or rock under a lateral jaror shock encountered by the lamp or its support. This point of supportof the upper section of the burner-tube,which carries the mantle g, isso located with reference to the parts that it is held normally in anupright position by means of spring-arms lainterposed between the twoburner-sections, the arms being preferably fastened by one end to theupper section and having the lower ends extending along the lowersection of the burner-tube on opposite sides and pressing against it, asshown in the drawings. Sufficient space is left between the two sectionsof the burner-tube to allow a free lateral movement of the upper sectionon the lower section, this lateral movement being a rocking or tippingmovement.

The lower section it of the burner-tube may be arranged to rest upon acushion b, (a spiral spring, as shown in Fig. 1 of the drawings,)interposed between it and a fixed or rigid part of the bracket or a partfast thereon, and this cushion absorbs all directly-vertical shocks orjars. In some forms of Welsbach lamps as a whole this additional cushionto absorb vertical shocks or jars is an advantage.

Inthe modified form of the invention, as shown in Fig. 3 of thedrawings, a central pin Z is supported on the lower section of theburner-tube, and the upper section is supported from a central point onthis pin. An adjustable support m, in this instance a screw fitting ascrew-threaded socket in the upper section, is provided, the pin Zresting in contact with the adjustable support. As in the otherinstance, the free lateral movement of the two parts is provided, thisfreedom of movement being governed by the tension of the spring-armsinterposed between the two sections of the burner-tube.

It is to be noted that an advantageous feature of improvement resides inlocating the support for the upper sectionin contact therewith at thecentral point, and this may be a point as this term is commonlyunderstood or a circular surface concentric with the center of the lowersection h of the burner-tube, this point of support being small in areaas to contact-surface, whereby the lamp is rendered particularlysensitive to sidewise shocks or jars equally in all directions, thismovement being governed and controlled by the cush-- section having ashoulder resting on its support, and a cushion interposed between saidburner-section and its support whereby lateral jars or shocks areprevented. I

3. In combination in a lamp having a fragile mantle over the flame, aburner-tube comprising an upper section supporting the frag ile mantleand loosely mounted on a lower section, the lower section of theburner-tube mounted on a support, the support and a yielding cushioninterposed between the two sections of the burner-tube.

4. In combination with a bracket-arm or like support, forming a sourceof supply, a mixer-tube secured to said support, an airshutter mountedon the mixer-tube, a sectional burner-tube mounted on a yielding cushionlocated within the air-shutter, the upper section of the burner-tubesupporting the fragile mantle for the lamp and loosely mounted on thelower section of the burnertube, and a yielding cushion interposedbetween the sections of the burner-tube.

5. In combination with a bracket-arm or like support, a gas-pipe, amixer-tube, an airshutter inclosin g a yielding cushion, the lowersection of the burner-tube surrounding the mixer-tube and mounted on theyielding cushion and also, extending within the upper section of theburner-tube, the upper section of the burner-tube loosely mounted on thelower section by a central support, and a yielding cushion interposedbetween the two sections of the burner-tube.

6. In combination with a bracket-arm or like support, a mixer-tube, asectional burnertube supported on the mixer-tube, one of said sectionsbearing a fragile mantle over the flame of the lamp and loosely mountedon the lower section, and a cushion interposed be tween said sections.

FRANK A. CORTIS.

Witnesses:

ERMA P. CoFFIN, ARTHUR B. JENKINS.

